Semispinalis thoracis muscle
Muscles · Latin: Musculus semispinalis thoracis
The semispinalis thoracis (or semispinalis dorsi) muscle consists of thin, narrow, fleshy fasciculi, interposed between tendons of considerable length.
It arises by a series of small tendons from the transverse processes of the sixth to the tenth thoracic vertebrae, and is inserted, by tendons, into the spinous processes of the upper four thoracic and lower two cervical vertebrae.
Definition from Wikipedia, CC BY-SA 4.0.